Fault code: 41009 SCANIA

Error identification:

Internal fault in the main unit.

Cause:

One of the sensors inside the main unit is short-circuited to battery voltage.

Notes:

The fault causes reductant injection to be switched off.

Action:

Detach the contactor to the heater element diaphragm pump. If the fault code becomes inactive, the heater element is faulty. If this is the case, renew the diaphragm pump.

Clear the fault code and switch the voltage off and on using the starter key. If the fault code persists, the main unit needs to be renewed.